Erratum to: Chromatographia (2011) 73:1121–1129 DOI 10.1007/s10337-011-2008-4

Unfortunately, in the original article names of the authors N. J. Yu, J. F. Guo and Y. M. Zhao were given incorrectly. The correct names are Nengjiang Yu, Jifen Guo and Yimin Zhao.